<?php
/**
 * db.php — SQLite database bootstrap & helpers
 */

define('DB_PATH', __DIR__ . '/../data/media.db');
define('MEDIA_DIR', __DIR__ . '/../media/');
define('MEDIA_URL', 'media/');

function get_db(): PDO {
    static $pdo = null;
    if ($pdo) return $pdo;

    $dir = dirname(DB_PATH);
    if (!is_dir($dir)) mkdir($dir, 0755, true);

    $pdo = new PDO('sqlite:' . DB_PATH);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
    $pdo->exec('PRAGMA journal_mode=WAL');
    $pdo->exec('PRAGMA foreign_keys=ON');

    // Schema
    $pdo->exec("
        CREATE TABLE IF NOT EXISTS settings (
            key   TEXT PRIMARY KEY,
            value TEXT NOT NULL
        );

        CREATE TABLE IF NOT EXISTS videos (
            id          INTEGER PRIMARY KEY AUTOINCREMENT,
            title       TEXT    NOT NULL DEFAULT 'Untitled',
            description TEXT    NOT NULL DEFAULT '',
            slug        TEXT    NOT NULL UNIQUE,
            thumbnail   TEXT    NOT NULL DEFAULT '',
            duration    INTEGER NOT NULL DEFAULT 0,
            sort_order  INTEGER NOT NULL DEFAULT 0,
            published   INTEGER NOT NULL DEFAULT 1,
            created_at  TEXT    NOT NULL DEFAULT (datetime('now')),
            updated_at  TEXT    NOT NULL DEFAULT (datetime('now'))
        );

        CREATE TABLE IF NOT EXISTS video_sources (
            id         INTEGER PRIMARY KEY AUTOINCREMENT,
            video_id   INTEGER NOT NULL REFERENCES videos(id) ON DELETE CASCADE,
            label      TEXT    NOT NULL DEFAULT '',
            source_type TEXT    NOT NULL DEFAULT 'local',
            file_path  TEXT    NOT NULL DEFAULT '',
            source_url TEXT    NOT NULL DEFAULT '',
            mime_type  TEXT    NOT NULL DEFAULT 'video/mp4',
            quality    TEXT    NOT NULL DEFAULT '720p',
            sort_order INTEGER NOT NULL DEFAULT 0
        );

        CREATE INDEX IF NOT EXISTS idx_videos_published  ON videos(published);
        CREATE INDEX IF NOT EXISTS idx_videos_sort       ON videos(sort_order, id);
        CREATE INDEX IF NOT EXISTS idx_videos_title      ON videos(title);
        CREATE INDEX IF NOT EXISTS idx_sources_video     ON video_sources(video_id);
    ");

    ensure_video_source_schema($pdo);
    $pdo->exec("CREATE INDEX IF NOT EXISTS idx_sources_type ON video_sources(source_type)");

    // Default settings
    $defaults = [
        'catalogue_per_page' => '10',
        'admin_password'     => password_hash('admin', PASSWORD_DEFAULT),
        'site_title'         => 'Ty Clifford',
        'site_sub'           => 'tyclifford.com / media',
        'url_rewrite_mode'   => 'pretty',
    ];
    $ins = $pdo->prepare("INSERT OR IGNORE INTO settings (key, value) VALUES (?, ?)");
    foreach ($defaults as $k => $v) $ins->execute([$k, $v]);

    return $pdo;
}

function ensure_video_source_schema(PDO $pdo): void {
    $cols = $pdo->query("PRAGMA table_info(video_sources)")->fetchAll();
    $names = array_column($cols, 'name');

    if (!in_array('source_type', $names, true)) {
        $pdo->exec("ALTER TABLE video_sources ADD COLUMN source_type TEXT NOT NULL DEFAULT 'local'");
    }
    if (!in_array('source_url', $names, true)) {
        $pdo->exec("ALTER TABLE video_sources ADD COLUMN source_url TEXT NOT NULL DEFAULT ''");
    }

    $pdo->exec("UPDATE video_sources SET source_type='local' WHERE source_type='' OR source_type IS NULL");
}

function setting(string $key, string $fallback = ''): string {
    $row = get_db()->prepare("SELECT value FROM settings WHERE key=?");
    $row->execute([$key]);
    $r = $row->fetch();
    return $r ? $r['value'] : $fallback;
}

function set_setting(string $key, string $value): void {
    get_db()->prepare("INSERT OR REPLACE INTO settings (key,value) VALUES (?,?)")
            ->execute([$key, $value]);
}

function url_rewrite_mode(): string {
    $mode = strtolower(setting('url_rewrite_mode', 'pretty'));
    return in_array($mode, ['pretty', 'query'], true) ? $mode : 'pretty';
}

function url_rewrite_enabled(): bool {
    return url_rewrite_mode() === 'pretty';
}

function public_base_path(): string {
    $script = str_replace('\\', '/', $_SERVER['SCRIPT_NAME'] ?? '');
    $dir = rtrim(dirname($script), '/');
    if ($dir === '/' || $dir === '.') $dir = '';
    if (str_ends_with($dir, '/admin')) $dir = substr($dir, 0, -6);
    return $dir;
}

function public_url_path(string $path): string {
    $base = public_base_path();
    $path = '/' . ltrim($path, '/');
    if ($path === '/') return $base === '' ? '/' : $base . '/';
    return $base . $path;
}

function public_media_url(string $path = ''): string {
    $media_url = public_url_path('/media/');
    $path = ltrim($path, '/');
    return $path === '' ? $media_url : rtrim($media_url, '/') . '/' . $path;
}

function public_home_url(): string {
    return url_rewrite_enabled() ? public_url_path('/') : public_url_path('/index.php');
}

function public_catalogue_url(): string {
    return url_rewrite_enabled() ? public_url_path('/all') : public_url_path('/catalogue.php');
}

function public_video_url(string $slug): string {
    $slug = trim($slug);
    if (url_rewrite_enabled()) return public_url_path('/v/' . rawurlencode($slug));
    return public_url_path('/index.php') . '?v=' . rawurlencode($slug);
}

function public_search_url(string $query): string {
    $query = trim($query);
    if ($query === '') return public_catalogue_url();
    if (url_rewrite_enabled()) return public_url_path('/search/' . rawurlencode($query));
    return public_url_path('/catalogue.php') . '?q=' . rawurlencode($query);
}

function public_page_url_pattern(string $base_url): string {
    return $base_url . (strpos($base_url, '?') === false ? '?' : '&') . 'page=%d';
}

function public_catalogue_page_url_pattern(string $search = ''): string {
    return public_page_url_pattern($search !== '' ? public_search_url($search) : public_catalogue_url());
}

function public_player_page_url_pattern(string $slug = ''): string {
    $base = $slug !== '' ? public_video_url($slug) : public_home_url();
    return public_page_url_pattern($base);
}

function public_request_path(): string {
    $path = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH);
    return is_string($path) && $path !== '' ? $path : '/';
}

function public_route_segments(): array {
    $path = public_request_path();
    $base = public_base_path();
    if ($base !== '' && ($path === $base || str_starts_with($path, $base . '/'))) {
        $path = substr($path, strlen($base));
    }
    $segments = array_values(array_filter(explode('/', trim($path, '/')), 'strlen'));
    return array_map('rawurldecode', $segments);
}

function public_video_slug_from_request(): string {
    $slug = trim((string)($_GET['v'] ?? ''));
    if ($slug !== '') return $slug;

    $segments = public_route_segments();
    return (($segments[0] ?? '') === 'v' && isset($segments[1])) ? trim($segments[1]) : '';
}

function public_search_query_from_request(): string {
    if (isset($_GET['q'])) return trim((string)$_GET['q']);

    $segments = public_route_segments();
    return (($segments[0] ?? '') === 'search' && isset($segments[1])) ? trim($segments[1]) : '';
}

function public_request_scheme(): string {
    return (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off') ? 'https' : 'http';
}

function public_origin(): string {
    return public_request_scheme() . '://' . ($_SERVER['HTTP_HOST'] ?? 'localhost');
}

function public_absolute_url(string $url): string {
    if (preg_match('#^[a-z][a-z0-9+.-]*://#i', $url)) return $url;
    if (str_starts_with($url, '//')) return public_request_scheme() . ':' . $url;
    if (str_starts_with($url, '/')) return public_origin() . $url;
    return public_origin() . public_url_path($url);
}

function make_slug(string $title, int $id = 0): string {
    $slug = strtolower(trim(preg_replace('/[^a-z0-9]+/i', '-', $title), '-'));
    if ($id) {
        $exists = get_db()->prepare("SELECT id FROM videos WHERE slug=? AND id!=?");
        $exists->execute([$slug, $id]);
    } else {
        $exists = get_db()->prepare("SELECT id FROM videos WHERE slug=?");
        $exists->execute([$slug]);
    }
    if ($exists->fetch()) $slug .= '-' . ($id ?: time());
    return $slug ?: 'video-' . time();
}

function mime_from_ext(string $path): string {
    $url_path = parse_url($path, PHP_URL_PATH);
    if (is_string($url_path) && $url_path !== '') {
        $path = $url_path;
    }
    $ext = strtolower(pathinfo($path, PATHINFO_EXTENSION));
    return match($ext) {
        'mp4'  => 'video/mp4',
        'm4v'  => 'video/mp4',
        'webm' => 'video/webm',
        'ogv'  => 'video/ogg',
        'ogg'  => 'video/ogg',
        'mov'  => 'video/quicktime',
        'mkv'  => 'video/x-matroska',
        'avi'  => 'video/x-msvideo',
        'm3u8' => 'application/vnd.apple.mpegurl',
        'mpd'  => 'application/dash+xml',
        'mp3'  => 'audio/mpeg',
        'm4a'  => 'audio/mp4',
        'aac'  => 'audio/aac',
        'wav'  => 'audio/wav',
        'flac' => 'audio/flac',
        default => 'video/mp4',
    };
}

function normalize_media_url(string $url): string {
    $url = trim($url);
    if ($url === '') return '';
    if (str_starts_with($url, '//')) $url = 'https:' . $url;
    if (!filter_var($url, FILTER_VALIDATE_URL)) return '';
    $scheme = strtolower((string)parse_url($url, PHP_URL_SCHEME));
    return in_array($scheme, ['http', 'https'], true) ? $url : '';
}

function media_host_matches(string $host, string $domain): bool {
    $host = strtolower($host);
    $domain = strtolower($domain);
    return $host === $domain || substr($host, -strlen('.' . $domain)) === '.' . $domain;
}

function media_scalar_string($value): string {
    return is_array($value) ? '' : trim((string)$value);
}

function media_query_values(string $url): array {
    $query = parse_url($url, PHP_URL_QUERY);
    if (!is_string($query) || $query === '') return [];
    $values = [];
    parse_str($query, $values);
    return is_array($values) ? $values : [];
}

function media_path_segments(string $url): array {
    $path = parse_url($url, PHP_URL_PATH);
    if (!is_string($path)) return [];
    $parts = array_values(array_filter(explode('/', trim($path, '/')), 'strlen'));
    return array_map('rawurldecode', $parts);
}

function media_extension_from_url(string $url): string {
    $path = parse_url($url, PHP_URL_PATH);
    return is_string($path) ? strtolower(pathinfo($path, PATHINFO_EXTENSION)) : '';
}

function media_guess_mime(string $url): string {
    $map = [
        'mp4' => 'video/mp4', 'm4v' => 'video/mp4', 'webm' => 'video/webm',
        'ogv' => 'video/ogg', 'ogg' => 'video/ogg', 'mov' => 'video/quicktime',
        'mkv' => 'video/x-matroska', 'avi' => 'video/x-msvideo',
        'm3u8' => 'application/vnd.apple.mpegurl', 'mpd' => 'application/dash+xml',
        'mp3' => 'audio/mpeg', 'm4a' => 'audio/mp4', 'aac' => 'audio/aac',
        'wav' => 'audio/wav', 'flac' => 'audio/flac',
    ];
    return $map[media_extension_from_url($url)] ?? '';
}

function media_append_query(string $base, array $params): string {
    $query = http_build_query($params, '', '&', PHP_QUERY_RFC3986);
    if ($query === '') return $base;
    return $base . (strpos($base, '?') === false ? '?' : '&') . $query;
}

function media_http_get(string $url, int $timeout = 12, string $accept = ''): array {
    $url = normalize_media_url($url);
    if ($url === '') return ['body' => '', 'code' => 0, 'content_type' => '', 'error' => 'Invalid URL.'];

    if ($accept === '') {
        $accept = 'image/avif,image/webp,image/png,image/jpeg,image/*;q=0.9,application/json;q=0.8,text/html;q=0.7,*/*;q=0.5';
    }
    $headers = [
        'User-Agent: Mozilla/5.0 (compatible; TyCliffordMedia/1.0)',
        'Accept: ' . $accept,
        'Accept-Language: en-US,en;q=0.9',
    ];

    if (function_exists('curl_init')) {
        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_MAXREDIRS => 5,
            CURLOPT_CONNECTTIMEOUT => $timeout,
            CURLOPT_TIMEOUT => $timeout,
            CURLOPT_HTTPHEADER => $headers,
            CURLOPT_HEADER => true,
        ]);
        $raw = curl_exec($ch);
        $err = curl_error($ch);
        $code = (int)curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
        $header_size = (int)curl_getinfo($ch, CURLINFO_HEADER_SIZE);
        $content_type = (string)curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
        curl_close($ch);

        if (!is_string($raw) || $raw === '') {
            return ['body' => '', 'code' => $code, 'content_type' => $content_type, 'error' => $err ?: 'Empty response.'];
        }

        return [
            'body' => substr($raw, $header_size),
            'code' => $code,
            'content_type' => $content_type,
            'error' => $code >= 400 ? 'HTTP ' . $code : '',
        ];
    }

    $context = stream_context_create([
        'http' => [
            'method' => 'GET',
            'header' => implode("\r\n", $headers),
            'timeout' => $timeout,
            'ignore_errors' => true,
        ],
    ]);
    $body = @file_get_contents($url, false, $context);
    $response_headers = $http_response_header ?? [];
    $code = 0;
    $content_type = '';
    foreach ($response_headers as $header) {
        if (preg_match('#^HTTP/\S+\s+(\d+)#', $header, $m)) $code = (int)$m[1];
        if (stripos($header, 'Content-Type:') === 0) $content_type = trim(substr($header, 13));
    }

    return [
        'body' => is_string($body) ? $body : '',
        'code' => $code,
        'content_type' => $content_type,
        'error' => $code >= 400 ? 'HTTP ' . $code : (!is_string($body) ? 'Unable to fetch URL.' : ''),
    ];
}

function media_parse_youtube_time(string $value): int {
    $value = trim($value);
    if ($value === '') return 0;
    if (ctype_digit($value)) return max(0, (int)$value);

    $seconds = 0;
    if (preg_match_all('/(\d+)\s*([hms])/i', $value, $matches, PREG_SET_ORDER)) {
        foreach ($matches as $match) {
            $amount = (int)$match[1];
            $unit = strtolower($match[2]);
            $seconds += $unit === 'h' ? $amount * 3600 : ($unit === 'm' ? $amount * 60 : $amount);
        }
    }
    return max(0, $seconds);
}

function media_clean_token(string $value, string $pattern = '/[^A-Za-z0-9_-]/'): string {
    $clean = preg_replace($pattern, '', trim($value));
    return is_string($clean) ? $clean : '';
}

function media_twitch_parent_host(): string {
    $host = $_SERVER['HTTP_HOST'] ?? $_SERVER['SERVER_NAME'] ?? 'localhost';
    $host = strtolower(trim((string)$host));
    $host = preg_replace('/:\d+$/', '', $host);
    return is_string($host) && $host !== '' ? $host : 'localhost';
}

function media_youtube_id_from_url(string $url): string {
    $host = strtolower((string)(parse_url($url, PHP_URL_HOST) ?? ''));
    $path = (string)(parse_url($url, PHP_URL_PATH) ?? '');
    $segments = media_path_segments($url);
    $query = media_query_values($url);

    $id = '';
    if (media_host_matches($host, 'youtu.be') && isset($segments[0])) $id = $segments[0];
    if ($id === '' && isset($query['v'])) $id = media_scalar_string($query['v']);
    if ($id === '' && preg_match('#/(?:embed|shorts|live|v)/([^/?#]+)#', $path, $m)) $id = $m[1];
    return media_clean_token($id);
}

function media_normalize_datetime(string $value): string {
    $value = trim(html_entity_decode($value, ENT_QUOTES | ENT_HTML5, 'UTF-8'));
    if ($value === '') return '';

    if (preg_match('/^(\d{4}-\d{2}-\d{2})/', $value, $m)) {
        return $m[1] . ' 00:00:00';
    }

    try {
        $date = new DateTimeImmutable($value);
        return $date->format('Y-m-d H:i:s');
    } catch (Throwable $e) {
        return '';
    }
}

function media_youtube_publish_datetime_from_html(string $html): string {
    $patterns = [
        '/<meta[^>]+itemprop=["\']datePublished["\'][^>]+content=["\']([^"\']+)["\']/i',
        '/<meta[^>]+content=["\']([^"\']+)["\'][^>]+itemprop=["\']datePublished["\']/i',
        '/"datePublished"\s*:\s*"([^"]+)"/',
        '/"publishDate"\s*:\s*"([^"]+)"/',
        '/"uploadDate"\s*:\s*"([^"]+)"/',
    ];

    foreach ($patterns as $pattern) {
        if (!preg_match($pattern, $html, $match)) continue;
        $value = json_decode('"' . str_replace('"', '\"', $match[1]) . '"');
        $date = media_normalize_datetime(is_string($value) ? $value : $match[1]);
        if ($date !== '') return $date;
    }

    return '';
}

function media_youtube_publish_datetime(string $url): string {
    $id = media_youtube_id_from_url($url);
    if ($id === '') return '';

    $watch_url = 'https://www.youtube.com/watch?v=' . rawurlencode($id);
    $fetch = media_http_get($watch_url, 15, 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8');
    if ($fetch['body'] === '' || $fetch['error'] !== '') return '';

    return media_youtube_publish_datetime_from_html($fetch['body']);
}

function media_youtube_source_url_for_video(int $video_id): string {
    $stmt = get_db()->prepare("
        SELECT source_url
        FROM video_sources
        WHERE video_id=? AND source_type='remote' AND source_url!=''
        ORDER BY sort_order ASC, id ASC
    ");
    $stmt->execute([$video_id]);

    foreach ($stmt->fetchAll() as $source) {
        $url = normalize_media_url($source['source_url'] ?? '');
        if ($url !== '' && media_youtube_id_from_url($url) !== '') return $url;
    }

    return '';
}

function media_apply_youtube_timestamp(int $video_id): array {
    $url = media_youtube_source_url_for_video($video_id);
    if ($url === '') return ['status' => 'no_youtube', 'date' => '', 'url' => ''];

    $published_at = media_youtube_publish_datetime($url);
    if ($published_at === '') return ['status' => 'not_found', 'date' => '', 'url' => $url];

    $stmt = get_db()->prepare("SELECT created_at FROM videos WHERE id=?");
    $stmt->execute([$video_id]);
    $current = (string)$stmt->fetchColumn();

    if (substr($current, 0, 10) === substr($published_at, 0, 10)) {
        return ['status' => 'already_correct', 'date' => $published_at, 'url' => $url];
    }

    get_db()->prepare("UPDATE videos SET created_at=?, updated_at=datetime('now') WHERE id=?")
            ->execute([$published_at, $video_id]);

    return ['status' => 'corrected', 'date' => $published_at, 'url' => $url];
}

function media_youtube_timestamp_candidates(int $limit): array {
    $limit = max(1, min(100, $limit));
    $stmt = get_db()->prepare("
        SELECT DISTINCT v.id
        FROM videos v
        INNER JOIN video_sources vs ON vs.video_id = v.id
        WHERE vs.source_type='remote'
          AND (
            vs.source_url LIKE '%youtube.com%'
            OR vs.source_url LIKE '%youtu.be%'
            OR vs.source_url LIKE '%youtube-nocookie.com%'
          )
        ORDER BY v.id DESC
        LIMIT :limit
    ");
    $stmt->bindValue(':limit', $limit, PDO::PARAM_INT);
    $stmt->execute();
    return array_map('intval', array_column($stmt->fetchAll(), 'id'));
}

function media_youtube_timestamp_candidate_count(): int {
    return (int)get_db()->query("
        SELECT COUNT(DISTINCT v.id)
        FROM videos v
        INNER JOIN video_sources vs ON vs.video_id = v.id
        WHERE vs.source_type='remote'
          AND (
            vs.source_url LIKE '%youtube.com%'
            OR vs.source_url LIKE '%youtu.be%'
            OR vs.source_url LIKE '%youtube-nocookie.com%'
          )
    ")->fetchColumn();
}

function media_correct_youtube_timestamps(int $limit = 25): array {
    $result = [
        'checked' => 0,
        'corrected' => 0,
        'already_correct' => 0,
        'not_found' => 0,
        'no_youtube' => 0,
    ];

    foreach (media_youtube_timestamp_candidates($limit) as $video_id) {
        $result['checked']++;
        $applied = media_apply_youtube_timestamp($video_id);
        $status = $applied['status'] ?? 'not_found';
        if (!isset($result[$status])) $status = 'not_found';
        $result[$status]++;
    }

    return $result;
}

function media_provider_oembed_endpoint(string $url, string $host): string {
    if (media_host_matches($host, 'youtube.com') || media_host_matches($host, 'youtu.be') || media_host_matches($host, 'youtube-nocookie.com')) {
        return 'https://www.youtube.com/oembed?format=json&url=' . rawurlencode($url);
    }
    if (media_host_matches($host, 'vimeo.com')) {
        return 'https://vimeo.com/api/oembed.json?url=' . rawurlencode($url);
    }
    if (media_host_matches($host, 'dailymotion.com') || media_host_matches($host, 'dai.ly')) {
        return 'https://www.dailymotion.com/services/oembed?url=' . rawurlencode($url);
    }
    if (media_host_matches($host, 'tiktok.com')) {
        return 'https://www.tiktok.com/oembed?url=' . rawurlencode($url);
    }
    if (media_host_matches($host, 'soundcloud.com')) {
        return 'https://soundcloud.com/oembed?format=json&url=' . rawurlencode($url);
    }
    if (media_host_matches($host, 'open.spotify.com')) {
        return 'https://open.spotify.com/oembed?url=' . rawurlencode($url);
    }
    if (media_host_matches($host, 'wistia.com') || media_host_matches($host, 'wi.st')) {
        return 'https://fast.wistia.com/oembed?url=' . rawurlencode($url);
    }
    return '';
}

function media_oembed_thumbnail_url(string $url, string $host): string {
    $endpoint = media_provider_oembed_endpoint($url, $host);
    if ($endpoint === '') return '';

    $fetch = media_http_get($endpoint, 8);
    if ($fetch['body'] === '' || $fetch['error'] !== '') return '';

    $data = json_decode($fetch['body'], true);
    if (!is_array($data)) return '';

    $thumb = normalize_media_url((string)($data['thumbnail_url'] ?? ''));
    return $thumb;
}

function media_provider_thumbnail_url(string $url): string {
    $url = normalize_media_url($url);
    if ($url === '') return '';

    $host = strtolower((string)(parse_url($url, PHP_URL_HOST) ?? ''));
    $path = (string)(parse_url($url, PHP_URL_PATH) ?? '');
    $segments = media_path_segments($url);

    if (media_host_matches($host, 'youtu.be') || media_host_matches($host, 'youtube.com') || media_host_matches($host, 'youtube-nocookie.com')) {
        $id = media_youtube_id_from_url($url);
        return $id !== '' ? 'https://i.ytimg.com/vi/' . rawurlencode($id) . '/hqdefault.jpg' : '';
    }

    if (media_host_matches($host, 'dailymotion.com') || media_host_matches($host, 'dai.ly')) {
        $id = '';
        if (media_host_matches($host, 'dai.ly') && isset($segments[0])) $id = $segments[0];
        if ($id === '' && preg_match('#/(?:embed/)?video/([^/?#_]+)#', $path, $m)) $id = $m[1];
        $id = media_clean_token($id);
        if ($id !== '') return 'https://www.dailymotion.com/thumbnail/video/' . rawurlencode($id);
    }

    return media_oembed_thumbnail_url($url, $host);
}

function media_thumbnail_extension(string $url, string $content_type): string {
    $content_type = strtolower($content_type);
    if (str_contains($content_type, 'png')) return 'png';
    if (str_contains($content_type, 'webp')) return 'webp';
    if (str_contains($content_type, 'gif')) return 'gif';

    $ext = media_extension_from_url($url);
    return in_array($ext, ['jpg', 'jpeg', 'png', 'webp', 'gif'], true) ? ($ext === 'jpeg' ? 'jpg' : $ext) : 'jpg';
}

function media_download_thumbnail(string $url, string $slug, string $label = 'auto'): string {
    $url = normalize_media_url($url);
    if ($url === '') return '';

    $fetch = media_http_get($url, 12);
    if ($fetch['body'] === '' || $fetch['error'] !== '') return '';
    if (function_exists('getimagesizefromstring') && !@getimagesizefromstring($fetch['body'])) return '';

    $thumb_dir = MEDIA_DIR . 'thumbs/';
    if (!is_dir($thumb_dir)) mkdir($thumb_dir, 0755, true);

    $label = media_clean_token($label);
    if ($label === '') $label = 'auto';
    $ext = media_thumbnail_extension($url, (string)$fetch['content_type']);
    $fname = $slug . '_' . $label . '_' . time() . '_' . substr(sha1($url), 0, 8) . '.' . $ext;

    return file_put_contents($thumb_dir . $fname, $fetch['body']) !== false ? 'thumbs/' . $fname : '';
}

function media_disabled_function(string $name): bool {
    $disabled = array_map('trim', explode(',', (string)ini_get('disable_functions')));
    return in_array($name, $disabled, true);
}

function media_ffmpeg_path(): string {
    $configured = trim((string)getenv('FFMPEG_PATH'));
    if ($configured !== '' && is_executable($configured)) return $configured;

    if (!function_exists('shell_exec') || media_disabled_function('shell_exec')) return '';
    $path = trim((string)@shell_exec('command -v ffmpeg 2>/dev/null'));
    return $path !== '' && is_executable($path) ? $path : '';
}

function media_thumbnail_from_local_video(string $file_path, string $slug): string {
    $ffmpeg = media_ffmpeg_path();
    if ($ffmpeg === '') return '';

    $source = MEDIA_DIR . ltrim($file_path, '/');
    if ($file_path === '' || !is_file($source) || !is_readable($source)) return '';

    $thumb_dir = MEDIA_DIR . 'thumbs/';
    if (!is_dir($thumb_dir)) mkdir($thumb_dir, 0755, true);
    $fname = $slug . '_frame_' . time() . '_' . substr(sha1($file_path), 0, 8) . '.jpg';
    $target = $thumb_dir . $fname;

    if (!function_exists('exec') || media_disabled_function('exec')) return '';
    $cmd = escapeshellarg($ffmpeg) . ' -y -ss 00:00:01 -i ' . escapeshellarg($source) . ' -frames:v 1 -vf ' . escapeshellarg('scale=1280:-2') . ' ' . escapeshellarg($target) . ' 2>/dev/null';
    @exec($cmd, $output, $code);

    if ($code === 0 && is_file($target) && filesize($target) > 0 && (!function_exists('getimagesize') || @getimagesize($target))) {
        return 'thumbs/' . $fname;
    }

    if (is_file($target)) unlink($target);
    return '';
}

function media_auto_thumbnail_for_video(int $video_id, string $slug): string {
    $stmt = get_db()->prepare("SELECT * FROM video_sources WHERE video_id=? ORDER BY sort_order ASC, id ASC");
    $stmt->execute([$video_id]);
    $sources = $stmt->fetchAll();

    foreach ($sources as $source) {
        if (!source_is_remote($source)) continue;
        $thumb_url = media_provider_thumbnail_url($source['source_url'] ?? '');
        $thumbnail = media_download_thumbnail($thumb_url, $slug, 'auto');
        if ($thumbnail !== '') return $thumbnail;
    }

    foreach ($sources as $source) {
        if (!source_is_local($source)) continue;
        $thumbnail = media_thumbnail_from_local_video($source['file_path'] ?? '', $slug);
        if ($thumbnail !== '') return $thumbnail;
    }

    return '';
}

function media_provider_embed(string $url): ?array {
    $parts = @parse_url($url);
    if (!is_array($parts) || empty($parts['host'])) return null;

    $host = strtolower((string)$parts['host']);
    $path = isset($parts['path']) ? (string)$parts['path'] : '';
    $segments = media_path_segments($url);
    $query = media_query_values($url);

    if (media_host_matches($host, 'youtu.be') || media_host_matches($host, 'youtube.com') || media_host_matches($host, 'youtube-nocookie.com')) {
        $id = media_youtube_id_from_url($url);
        if ($id !== '') {
            $params = ['rel' => '0', 'modestbranding' => '1', 'playsinline' => '1'];
            $start = isset($query['start'])
                ? media_parse_youtube_time(media_scalar_string($query['start']))
                : (isset($query['t']) ? media_parse_youtube_time(media_scalar_string($query['t'])) : 0);
            if ($start > 0) $params['start'] = (string)$start;
            return ['provider' => 'youtube', 'embed' => media_append_query('https://www.youtube-nocookie.com/embed/' . rawurlencode($id), $params)];
        }

        if (isset($query['list'])) {
            $list = media_clean_token(media_scalar_string($query['list']));
            if ($list !== '') {
                return ['provider' => 'youtube', 'embed' => media_append_query('https://www.youtube-nocookie.com/embed/videoseries', [
                    'list' => $list, 'rel' => '0', 'modestbranding' => '1', 'playsinline' => '1',
                ])];
            }
        }
    }

    if (media_host_matches($host, 'vimeo.com') && preg_match('#/(?:video/)?(\d+)#', $path, $m)) {
        return ['provider' => 'vimeo', 'embed' => media_append_query('https://player.vimeo.com/video/' . rawurlencode($m[1]), [
            'title' => '0', 'byline' => '0', 'portrait' => '0',
        ])];
    }

    if (media_host_matches($host, 'dailymotion.com') || media_host_matches($host, 'dai.ly')) {
        $id = '';
        if (media_host_matches($host, 'dai.ly') && isset($segments[0])) $id = $segments[0];
        if ($id === '' && preg_match('#/(?:embed/)?video/([^/?#_]+)#', $path, $m)) $id = $m[1];
        $id = media_clean_token($id);
        if ($id !== '') return ['provider' => 'dailymotion', 'embed' => 'https://www.dailymotion.com/embed/video/' . rawurlencode($id)];
    }

    if (media_host_matches($host, 'twitch.tv')) {
        $parent = media_twitch_parent_host();
        if (preg_match('#/videos/(\d+)#', $path, $m)) {
            return ['provider' => 'twitch', 'embed' => media_append_query('https://player.twitch.tv/', ['video' => $m[1], 'parent' => $parent, 'autoplay' => 'false'])];
        }
        if (preg_match('#/([^/]+)/clip/([^/?#]+)#', $path, $m)) {
            return ['provider' => 'twitch', 'embed' => media_append_query('https://clips.twitch.tv/embed', ['clip' => media_clean_token($m[2]), 'parent' => $parent, 'autoplay' => 'false'])];
        }
        if (isset($segments[0]) && $segments[0] !== '') {
            return ['provider' => 'twitch', 'embed' => media_append_query('https://player.twitch.tv/', ['channel' => media_clean_token($segments[0]), 'parent' => $parent, 'autoplay' => 'false'])];
        }
    }

    if (media_host_matches($host, 'clips.twitch.tv') && isset($segments[0])) {
        return ['provider' => 'twitch', 'embed' => media_append_query('https://clips.twitch.tv/embed', ['clip' => media_clean_token($segments[0]), 'parent' => media_twitch_parent_host(), 'autoplay' => 'false'])];
    }

    if (media_host_matches($host, 'facebook.com') || media_host_matches($host, 'fb.watch')) {
        return ['provider' => 'facebook', 'embed' => media_append_query('https://www.facebook.com/plugins/video.php', ['href' => $url, 'show_text' => 'false', 'width' => '1280'])];
    }

    if (media_host_matches($host, 'tiktok.com') && preg_match('#/video/(\d+)#', $path, $m)) {
        return ['provider' => 'tiktok', 'embed' => 'https://www.tiktok.com/embed/v2/' . rawurlencode($m[1])];
    }

    if (media_host_matches($host, 'instagram.com') && preg_match('#/(p|reel|tv)/([^/?#]+)#', $path, $m)) {
        return ['provider' => 'instagram', 'embed' => 'https://www.instagram.com/' . rawurlencode($m[1]) . '/' . rawurlencode($m[2]) . '/embed'];
    }

    if ((media_host_matches($host, 'twitter.com') || media_host_matches($host, 'x.com')) && preg_match('#/status/(\d+)#', $path, $m)) {
        return ['provider' => 'twitter', 'embed' => media_append_query('https://platform.twitter.com/embed/Tweet.html', ['id' => $m[1]])];
    }

    if (media_host_matches($host, 'soundcloud.com')) {
        return ['provider' => 'soundcloud', 'embed' => media_append_query('https://w.soundcloud.com/player/', ['url' => $url, 'auto_play' => 'false', 'show_teaser' => 'true'])];
    }

    if (media_host_matches($host, 'open.spotify.com') && isset($segments[0], $segments[1])) {
        $type = media_clean_token($segments[0]);
        $id = media_clean_token($segments[1]);
        if (in_array($type, ['album', 'artist', 'episode', 'playlist', 'show', 'track'], true) && $id !== '') {
            return ['provider' => 'spotify', 'embed' => 'https://open.spotify.com/embed/' . rawurlencode($type) . '/' . rawurlencode($id)];
        }
    }

    if (media_host_matches($host, 'drive.google.com')) {
        $id = '';
        if (preg_match('#/file/d/([^/]+)#', $path, $m)) $id = $m[1];
        elseif (isset($query['id'])) $id = media_scalar_string($query['id']);
        $id = media_clean_token($id);
        if ($id !== '') return ['provider' => 'google-drive', 'embed' => 'https://drive.google.com/file/d/' . rawurlencode($id) . '/preview'];
    }

    if ((media_host_matches($host, 'wistia.com') || media_host_matches($host, 'wi.st')) && preg_match('#/(?:medias/)?([A-Za-z0-9]+)#', $path, $m)) {
        return ['provider' => 'wistia', 'embed' => 'https://fast.wistia.net/embed/iframe/' . rawurlencode($m[1])];
    }

    if (media_host_matches($host, 'streamable.com') && isset($segments[0])) {
        return ['provider' => 'streamable', 'embed' => 'https://streamable.com/e/' . rawurlencode(media_clean_token($segments[0]))];
    }

    if (media_host_matches($host, 'loom.com') && isset($segments[0], $segments[1]) && $segments[0] === 'share') {
        return ['provider' => 'loom', 'embed' => 'https://www.loom.com/embed/' . rawurlencode(media_clean_token($segments[1]))];
    }

    return null;
}

function media_rewrite_direct_url(string $url): string {
    $host = strtolower((string)(parse_url($url, PHP_URL_HOST) ?? ''));
    $path = (string)(parse_url($url, PHP_URL_PATH) ?? '');

    if (media_host_matches($host, 'dropbox.com')) {
        $parts = @parse_url($url);
        if (is_array($parts)) {
            $query = [];
            if (isset($parts['query'])) parse_str((string)$parts['query'], $query);
            unset($query['dl'], $query['raw']);
            $query['raw'] = '1';

            $rebuilt = ($parts['scheme'] ?? 'https') . '://' . ($parts['host'] ?? 'www.dropbox.com');
            $rebuilt .= $parts['path'] ?? '';
            $rebuilt = media_append_query($rebuilt, $query);
            if (isset($parts['fragment'])) $rebuilt .= '#' . $parts['fragment'];
            return $rebuilt;
        }
    }

    if (media_host_matches($host, 'github.com') && preg_match('#^/([^/]+)/([^/]+)/blob/([^/]+)/(.+)$#', $path, $m)) {
        return 'https://raw.githubusercontent.com/' . rawurlencode($m[1]) . '/' . rawurlencode($m[2]) . '/' . rawurlencode($m[3]) . '/' . str_replace('%2F', '/', rawurlencode($m[4]));
    }

    return $url;
}

function media_classify_kind(string $url, string $mime, string $forced_mode = 'auto'): string {
    $forced_mode = strtolower($forced_mode);
    if (in_array($forced_mode, ['video', 'audio', 'hls', 'dash', 'iframe'], true)) return $forced_mode;

    $ext = media_extension_from_url($url);
    $mime_lc = strtolower($mime);
    if ($ext === 'm3u8' || in_array($mime_lc, ['application/x-mpegurl', 'application/vnd.apple.mpegurl'], true)) return 'hls';
    if ($ext === 'mpd' || $mime_lc === 'application/dash+xml') return 'dash';
    if (str_starts_with($mime_lc, 'audio/')) return 'audio';
    if (str_starts_with($mime_lc, 'video/')) return 'video';
    if (in_array($ext, ['mp3', 'm4a', 'aac', 'wav', 'flac', 'oga', 'opus'], true)) return 'audio';
    if (in_array($ext, ['mp4', 'm4v', 'webm', 'ogv', 'ogg', 'mov', 'mkv', 'avi', 'wmv', 'flv', 'ts', '3gp', '3g2'], true)) return 'video';
    return 'unknown';
}

function source_storage_mime_from_url(string $url): string {
    $url = normalize_media_url($url);
    if ($url === '') return 'video/mp4';
    if (media_provider_embed($url)) return 'text/html';
    $direct = media_rewrite_direct_url($url);
    return media_guess_mime($direct) ?: 'text/html';
}

function source_is_remote(array $source): bool {
    return ($source['source_type'] ?? 'local') === 'remote';
}

function source_is_local(array $source): bool {
    return !source_is_remote($source);
}

function source_location(array $source): string {
    return source_is_remote($source) ? ($source['source_url'] ?? '') : ($source['file_path'] ?? '');
}

function source_public_url(array $source, string $media_base = MEDIA_URL): string {
    if (source_is_remote($source)) {
        return $source['source_url'] ?? '';
    }

    return rtrim($media_base, '/') . '/' . ltrim($source['file_path'] ?? '', '/');
}

function source_player_data(array $source, string $media_base = MEDIA_URL): ?array {
    $is_remote = source_is_remote($source);
    $original_url = $is_remote ? normalize_media_url($source['source_url'] ?? '') : source_public_url($source, $media_base);
    if ($original_url === '') return null;

    if ($is_remote) {
        $provider = media_provider_embed($original_url);
        $play_url = $provider ? $original_url : media_rewrite_direct_url($original_url);
        $mime = $provider ? 'text/html' : trim($source['mime_type'] ?? '');
        if ($mime === '' || $mime === 'text/html') $mime = $provider ? 'text/html' : media_guess_mime($play_url);
        $kind = $provider ? 'iframe' : media_classify_kind($play_url, $mime);
        if ($kind === 'unknown') {
            $kind = 'iframe';
            $mime = 'text/html';
        }
        $embed = $provider['embed'] ?? $play_url;
        $provider_name = $provider['provider'] ?? '';
    } else {
        $play_url = $original_url;
        $mime = trim($source['mime_type'] ?? '') ?: mime_from_ext($play_url);
        $kind = media_classify_kind($play_url, $mime);
        $embed = $play_url;
        $provider_name = '';
    }

    $label = trim($source['label'] ?? '') ?: trim($source['quality'] ?? '');
    if ($label === '') $label = $provider_name ?: (media_extension_from_url($play_url) ?: $kind);

    return [
        'url' => $play_url,
        'original_url' => $original_url,
        'embed' => $embed,
        'provider' => $provider_name,
        'mime' => $mime,
        'kind' => $kind,
        'label' => $label,
    ];
}

function source_provider_label(array $source): string {
    $player = source_player_data($source);
    if (!$player) return source_is_remote($source) ? 'External URL' : 'Uploaded File';
    if (($player['provider'] ?? '') !== '') return ucwords(str_replace('-', ' ', $player['provider'])) . ' Embed';
    if (($player['kind'] ?? '') === 'iframe') return 'External Embed';
    return source_is_remote($source) ? 'External URL' : 'Uploaded File';
}

function format_duration(int $seconds): string {
    if ($seconds <= 0) return '';
    $h = intdiv($seconds, 3600);
    $m = intdiv($seconds % 3600, 60);
    $s = $seconds % 60;
    if ($h) return sprintf('%d:%02d:%02d', $h, $m, $s);
    return sprintf('%d:%02d', $m, $s);
}

function h(string $s): string {
    return htmlspecialchars($s, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
}

function get_videos_paginated(int $page, int $per_page, bool $published_only = true, string $search = ''): array {
    $db = get_db();
    $where_parts = [];
    $bind = [];
    $search = trim($search);
    if ($published_only) {
        $where_parts[] = 'v.published=1';
    }
    if ($search !== '') {
        $where_parts[] = '(v.title LIKE :q OR v.description LIKE :q OR v.slug LIKE :q)';
        $bind[':q'] = '%' . $search . '%';
    }
    $where = $where_parts ? 'WHERE ' . implode(' AND ', $where_parts) : '';
    $count = $db->prepare("SELECT COUNT(*) FROM videos v $where");
    foreach ($bind as $key => $value) $count->bindValue($key, $value);
    $count->execute();
    $total = $count->fetchColumn();
    $total_pages = (int)ceil($total / $per_page);
    if ($total_pages > 0) {
        $page = min($page, $total_pages);
    }
    $offset = ($page - 1) * $per_page;
    $rows  = $db->prepare("
        SELECT v.*, GROUP_CONCAT(CASE WHEN vs.source_type='remote' THEN vs.source_url ELSE vs.file_path END,'||') AS source_paths
        FROM videos v
        LEFT JOIN video_sources vs ON vs.video_id = v.id
        $where
        GROUP BY v.id
        ORDER BY v.sort_order ASC, v.id DESC
        LIMIT :limit OFFSET :offset
    ");
    foreach ($bind as $key => $value) $rows->bindValue($key, $value);
    $rows->bindValue(':limit', $per_page, PDO::PARAM_INT);
    $rows->bindValue(':offset', $offset, PDO::PARAM_INT);
    $rows->execute();
    return [
        'videos'       => $rows->fetchAll(),
        'total'        => (int)$total,
        'page'         => $page,
        'per_page'     => $per_page,
        'total_pages'  => $total_pages,
    ];
}

function get_video_by_slug(string $slug): ?array {
    $db  = get_db();
    $row = $db->prepare("SELECT * FROM videos WHERE slug=? AND published=1");
    $row->execute([$slug]);
    $v = $row->fetch();
    if (!$v) return null;
    $sources = $db->prepare("SELECT * FROM video_sources WHERE video_id=? ORDER BY sort_order ASC");
    $sources->execute([$v['id']]);
    $v['sources'] = $sources->fetchAll();
    return $v;
}

function get_video_by_id(int $id): ?array {
    $db  = get_db();
    $row = $db->prepare("SELECT * FROM videos WHERE id=?");
    $row->execute([$id]);
    $v = $row->fetch();
    if (!$v) return null;
    $sources = $db->prepare("SELECT * FROM video_sources WHERE video_id=? ORDER BY sort_order ASC");
    $sources->execute([$v['id']]);
    $v['sources'] = $sources->fetchAll();
    return $v;
}